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Mostly mid 1970s Heresy I, IIs, LaScalas, Belle and Klipschorn maintenance, sealing, and placement questions


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Mostly mid 1970s Heresy I, IIs, LaScalas, Belle and Klipschorn maintenance, sealing, and placement questions

 

Hello Folks:

Mostly mid 1970s Heresy I, IIs, LaScalas, Belle and Klipschorn maintenance, sealing, and placement questions

I have been reading many of the old, sometimes 20 year old posts. Many of the project and photo links no longer work :(. Moved into my new house. 1890s, hardwood floors 12-14 foot ceilings and 14 x27 ft main room plus 11 x 14 foot bedroom.  Higher floor moldings than the K horn rear cutouts.

 

General questions, some of which I am only asking due to the high cost and / or limited ability to get parts. Pre COVID, I would likely just do these. On all speakers, but do the big boys first: check all caps and replace the spam can caps on all of the larger speakers that were not previously replaced about 15 years ago, post Hurricane Katrina. Should I just contact Bob Crites? I will assume the crossovers, either original Klipsch or ALKs that I built when he sold the kits years ago are otherwise ok.

I know I have a LaScala with a blown tweeter. Which replacement is suggested and will xover changes be required? I do have some baby butt JBL tweeters. Not sure if ok with the xovers.

Should all cabinets be opened to check seals, gaskets and snug placement of woofers, mids, and tweeters? Re-gasket and reseal as needed – what do folks suggest for replacement gaskets / seals?  Or: if it ain’t broke, don’t fix it? Should “O” rings between Alnico or KL drivers and various Klipsch horn components be replaced? If so, with what – just red rubber 25 cent plumber’s O rings? I have never opened any of the large speaker woofer panels / dog houses, etc. I have owned all speakers for about 15-34 years. FWIW I do have 1 set of wooden horn with 1 inch throats I think for the Khorns and a set of JBL radial horns of similar size (still looking for the drivers, lost in a box someplace).

 

Old place had uneven stone floors and crumbly brick walls on 3 sides, plus roof leaks. 17 x 40 uniroom with high sloped ceiling (about 12-17 ft high) and good acoustics. New main room is much smaller, rectangular and without any carpeting or treatments is sonically very harsh. None of the 4 large outside windows work anymore – sealed shut long ago. No idea for the age or “firmness” of the existing plasterboard or drywall, but likely before the 1980s. I do not want to mess the place up making additional 4 x 4 ft 1 in thick plywood wall corners and triangle above the floor to brace things better. This would also likely require screwing the 4 x 4 s above the existing baseboards and floor.

 

For sealing the khorns into a corner, the issue for me is that the baseboard is a few inches taller than the lower Khorn cutout. Should I make some cuts onto the Khorn or simply cut some strips of 1-2 inch wide x 1-2 inch thick pieces of wood and use foam pipe insulation or door seal around them and the rear of the Khorn to make a wall seal on the sides? Some great old posts with pics, like Garyd9 on 2 22 2004 (and many others): https://community.klipsch.com/index.php?/topic/37435-sealing-bass-bin-of-khorn/page/2/. Includes the wood corner braces too.

I did not find a consensus on how to seal the top few inches or the bottom few inches in the center rear of the K horn woofer cabinet against the vertical wall corner. Suggestions?

 

For sealing any of the large speakers to the floor (not the Heresy’s I guess) these seem to be representative posts:

HDBRbuilder had several posts emphasizing the use of grippers, from Jan 7, 2009: Dr. Who: I would like to remind that if it is NOT grippers, then it may NOT have the same effect. Grippers are peel and stick 1/4" thick NEOPRENE with a traction enhancing non-stick side, which will "squish" somewhat under weight and give a better stability on SMOOTH-SURFACED floors which are slightly uneven.

 

Groomlakearea51Posted March 14, 2007

Yup, pipe insulation works perfectly; You can also use 1/4 size (also comes with the "peel off" tape for the sticky edge).

To seal to the floor.... I replaced the factory metal gliders (they will tear up a hardwood floor....) with teflon "gliders", but used more of them, including three "inboard" in the center; then used a piece of 3/16" thick x 3/4" wide closed cell foam weather stripping, but did not peel off the the "floor" side "sticky" cover. Slides around perfectly. Cheap to replace after several "move out for spring cleaning" moves that will tend to wear it off.

I'm also debating about doing the same thing on the edges instead of pipe insulation next time around. Easier to trim and gets them very close to the wall.

 

My humble Qs: since the 100+ pound LaScala, Belle, or Khorn is technically on small pieces of squished slightly pliable material, is it really “nailed” to the floor? I found some Scotch 8 gripping pads, 1.5 in diam at Home Depot for about $5.00, SP940-NA, 0-51141 59807-9 bar code. I also looked at some of the kitchen drawer liners at Walmart: https://www.walmart.com/search?q=drawer+liner. Could something like these do the trick? Mostly under $1 per foot.

How easy or difficult is it to extract those small metal gliders from the factory?

I can see doing this with the grippers and the LaScalas and Belle as 2 folks could move the speakers into place with only mildly destroyed finger tips and knuckles at worst.

But why not just remove the metal gliders and place directly on the floor with maybe a few pieces of paper or cardboard or those floor sample freebies from Home Depot or Lowes stuffed under a corner to prevent any issues from uneven hardwood? Or even a few pieces of thin wood directly under the corners or fully under the outer floor edges of speakers and using foam or gasket to seal air around the corners and just leave the metal gliders in place?

As for the Khorns, doing the grippers plus sealing the rear woofer cabinet to the wall corner will be a real problem so as not to mess up the floor and our hands. Since folks agree not to place the Khorns on a carpet (carpet plastic bottom to the KH bottom), I was thinking of using very thin wood strips above the floor, maybe ¼-½ in thick. For example, just cut to needed length: from Lowes: ReliaBilt 1/4-in x 2-in x 4-ft Square Unfinished Poplar Board Model #POPSRL142SU04  $3.04  Seems cheap and easy.

Could use multiple wood strips both to move the speakers in and out and seal the air around the KH base similar to the vertical corner walls (adding a touch of foam at the triangle corners). Likely a major finger saver too. The metal sliders could be left in place. Would folks foam or weather strip seal the KH bottoms to the floor (if it could even be done) to prevent any movement through the “cracks”?

 

Thx

 

From NOLA with love

 

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